i used to be big into adultfriendfinder years ago it was always guys wanting you to fuck their wives i did bang a few of their wives the guys would just sit there and stare this one chick kept wanting to come back with her husband and he was a police officer im pretty sure he was based but was into that type of thing i would say there is a pejorative use of cuck which wouldnt apply to people just into that fetish much like people used to say faggot all the time as an insult until it became non pc